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| author | Borislav Petkov (AMD) <bp@alien8.de> | 2024-09-11 05:13:46 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-10 16:03:21 +0200 |
| commit | 2b6a5fbe9dc1842e3485557a057c8e6311b6fd72 (patch) | |
| tree | a863ff5c86bfa9420fb63ce26264315ca3a050dd /Documentation | |
| parent | 8a7ac2737211451b8b98657b919c4c4e0a4c0c2f (diff) | |
| download | linux-2b6a5fbe9dc1842e3485557a057c8e6311b6fd72.tar.gz linux-2b6a5fbe9dc1842e3485557a057c8e6311b6fd72.tar.bz2 linux-2b6a5fbe9dc1842e3485557a057c8e6311b6fd72.zip | |
x86/bugs: Rename MDS machinery to something more generic
Commit f9af88a3d384c8b55beb5dc5483e5da0135fadbd upstream.
It will be used by other x86 mitigations.
No functional changes.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst | 4 | ||||
| -rw-r--r-- | Documentation/arch/x86/mds.rst | 8 |
2 files changed, 5 insertions, 7 deletions
diff --git a/Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst b/Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst index c98fd11907cc..e916dc232b0f 100644 --- a/Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst +++ b/Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst @@ -157,9 +157,7 @@ This is achieved by using the otherwise unused and obsolete VERW instruction in combination with a microcode update. The microcode clears the affected CPU buffers when the VERW instruction is executed. -Kernel reuses the MDS function to invoke the buffer clearing: - - mds_clear_cpu_buffers() +Kernel does the buffer clearing with x86_clear_cpu_buffers(). On MDS affected CPUs, the kernel already invokes CPU buffer clear on kernel/userspace, hypervisor/guest and C-state (idle) transitions. No diff --git a/Documentation/arch/x86/mds.rst b/Documentation/arch/x86/mds.rst index c58c72362911..43106f349cc3 100644 --- a/Documentation/arch/x86/mds.rst +++ b/Documentation/arch/x86/mds.rst @@ -93,7 +93,7 @@ enters a C-state. The kernel provides a function to invoke the buffer clearing: - mds_clear_cpu_buffers() + x86_clear_cpu_buffers() Also macro CLEAR_CPU_BUFFERS can be used in ASM late in exit-to-user path. Other than CFLAGS.ZF, this macro doesn't clobber any registers. @@ -185,9 +185,9 @@ Mitigation points idle clearing would be a window dressing exercise and is therefore not activated. - The invocation is controlled by the static key mds_idle_clear which is - switched depending on the chosen mitigation mode and the SMT state of - the system. + The invocation is controlled by the static key cpu_buf_idle_clear which is + switched depending on the chosen mitigation mode and the SMT state of the + system. The buffer clear is only invoked before entering the C-State to prevent that stale data from the idling CPU from spilling to the Hyper-Thread |